Where can I find a Diamond

Diamonds can be found in the Sechs Territory – first defeat the Maya Road boss.

How do I find the Blue Core?

Sechs Territory, in the area before you need to open the two switches.

Where are the Sword Flowers and Shield Flowers?

Defeating the Floating Empire bosses. Also you can defeat the Demon’s Den boss, who yields a Dungeon Seed (which you can then plant and go in, defeat the boss within for the Shield Flower or Sword Flower). You can repeat this step.

Where can I find a yellow core

Look for the fair near Sercerezo Hill. You may need to continue to enter and re-enter the Idra Cave area with the five mushroom covered stumps. They are also not a 100% drop so it may take a while.

Where is the Proof of Warrior?

Obsidian Mansion

What is the maximum Friendship / Love level

Maximum Friendship/Love Level for Rune Factory 4 is lv. 99.

How do you date Dolce?

To get Dolce to open up to the townspeople you need to activate the running signs event. This event is triggered by going to the shop when people are gathered there.